_getc_nolock, _getwc_nolock
Reads a character from a stream.
int _getc_nolock( FILE *stream ); wint_t _getwc_nolock( FILE *stream );
Parameters
- stream
-
Input stream.
See getc, getwc.
These functions are identical to getc and getwc except that they do not lock the calling thread. They might be faster because they do not incur the overhead of locking out other threads. Use these functions only in thread-safe contexts such as single-threaded applications or where the calling scope already handles thread isolation.
| Tchar.h routine | _UNICODE and _MBCS not defined | _MBCS defined | _UNICODE defined |
|---|---|---|---|
| _gettc_nolock | getc_nolock | getc_nolock | getwc_nolock |
| Routine | Required header | Compatibility |
|---|---|---|
| getc_nolock | <stdio.h> | ANSI, Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 |
| getwc_nolock | <stdio.h> or <wchar.h> | ANSI, Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 |
For more compatibility information, see Compatibility in the Introduction.
// crt_getc_nolock.c
// Use getc to read a line from a file.
#include <stdio.h>
int main()
{
char buffer[81];
int i, ch;
FILE* fp;
// Read a single line from the file "crt_getc_nolock.txt".
fopen_s(&fp, "crt_getc_nolock.txt", "r");
if (!fp)
{
printf("Failed to open file crt_getc_nolock.txt.\n");
exit(1);
}
for (i = 0; (i < 80) && ((ch = getc(fp)) != EOF)
&& (ch != '\n'); i++)
{
buffer[i] = (char) ch;
}
// Terminate string with a null character
buffer[i] = '\0';
printf( "Input was: %s\n", buffer);
fclose(fp);
}
